There are 5 consoles in the market not just Wii, XBox 360 and PS3.
My predictions for 2008:
1.Nintendo DS 2.Nintendo Wii 3.PSP 4.XBox 360 5.PS3

dont no how u got ps3 last when its been selling pretty fast and more then 360 for a while now.... but we will see.

1.DS

2Wii

3.psp

4.ps3

5.360

thats more like it to me

Couple things -

1) Sony lowered its lifetime projections through March 2008 to 9.5 million shipped from the original 11 million shipped in fiscal 2008 (April 2007 to March 2008).  However, Sony is in the Black.  PS2 sales will remain in the 5-7 million range (500k Japan, 2.75 million Americas, 3 million Others would be my guess) this year.  My take is Sony has to lower prices significantly on PS3 this year while PS2 is still raking in billions in revenue (between games, hardware, accessories, etc) at profitable levels.  In 2009, PS2 hardware sales will dip to 2-4 million units worldwide, and by that time PS3 needs to be established and profitable in its own right for Sony. 

Anyway, PS3, if Sony meets its lowered projections, will hit 13.07 million units shipped worldwide by 3/31/2008.  

Lets say PS3 is $300/$400 in most places worldwide for the second half of 2008 through 3/31/2009.  Current hardware levels per week are about 35k (Japan), 50k (Americas), and 65k (Others).  Call if 660k in a 31 day month.  A price cut I think would boost sales 50% in Japan, 30% in the Americas, and 30% in Others.  Through March then, Sony will have sold through 1.5 million PS3s in 2008, bringing the total worldwide sell through to 10.4 million, and I expect shipments to be at about 12.25 million worldwide.

Sales will be about the same in April, bringing PS3 to 11 million w/w in sell through.  May will see sales of 900k with GTA4, June will see sales of 750k.  June will be back to 650k.  On July 1, I expect another price drop - and sales will rise to 50k/65k/85k - about 200k/week for July & August - 1750k between the two months.  September and October will see rising sales in the west, offset by seasonal declines in Japan - 1500k for the two months.  November will be (J/A/E) 120k/530k/850k - 1500k worldwide.  December will be 180k/1100k/1720k - 3000k worldwide.  

That means I expect PS3 to reach 21 million in sellthrough in 2008 - with about 23.5 million shipped worldwide.  Sony will probably consider 23.5 million in shipments through Dec 2008 about 15% less than where they wanted PS3 to be given the pricing strategies.

2)  Nintendo is going to beat its projections again - slightly - through March 2008.  Why? Smash appears to have had a bigger than expected (internally) launch in Japan.  So instead of 24.37 million Wiis shipped through March 31 2008, I expect 25 million.  Wii sales for February should be about 1.375 million worldwide.  Sales will increase to maybe 1.7 million in March when Smash launches in the West, so Nintendo will be pushing 23-24 million in sell through by the end of March.  Depending on when Wii Fit launches, sales in the West could be anywhere from 1000k-1400k per month for a few months, with Japan accounting for 250k-350k.  I'm going with a late June launch of Wii Fit.  I have Wii at 27 million in sell through by the end of June.  After wards, Wii sells 1.66 million a month through September - bringing it to 32 million in sell through by the end of September.  Seasonal decreased in Japan mean will sell only 1.5 million in October, bringing it to 33.5 million.  November sees 3.5 million in sales (1750k/1450k/300k) - bringing it to 37 million worldwide in sell through.  December accompanies stunning sales - 7 million - and Wii hits 44.5 million in sell through, and 48 million in shipments - that is, 23 million Wiis shipped worldwide in 9 months (April 1 to Dec 31).  By March 2009, Wii passes 52 million shipped worldwide.

3) Xbox 360 will sell 500k/month worldwide through March (reaching 17.8 million in sell through worldwide).  It will decline to 400k in April - before doubling in May on GTAIV and a worldwide $50 price cut to 800k.  June-August sales will be 2100k worldwide.  September will see another price cut - in Europe and Japan - boosting sales to 900k worldwide.  October will see a small dip to 850k.  November will be 1550k worldwide, and December will be 3000k - bringing lifetime Xbox 360 sales to 27.4 million worldwide, and 30 million shipped.  Without two price drops, I see Xbox 360 sales topping out in the 25 million range in sell through, and about 27.5 million shipped worldwide.

Lol I have seen a lot of predictions that say the 360 lead will INCREASE. How? If they drop the price and Sony dont respond maybe, but even then I dont see it. If GT5 arrives for XMAS 08 then 360 will get rolled over. I expect the Wii to go from strength to strength. I may get one. See my sig for my guesses. Remember the Wii is usually supply constrained so who knows what the demand could be.

Time to check the first results:

True so far as I remember the single weeks, but in some weeks it was very close.

That's highly unlikely now. The Wii is more than a million behind, it will not happen in April.

Wrong three times. All three consoles had two more million sellers, than I predicted: XBOX360 has 35, Wii has 22 and the PS3 has 10.

Wii :34

XBOX360 :25

PS3: 19,5

I think Wii will make it to 45 million before 2009. Possibly even 50 if production increases enough

Bumped for the lols.

OMG the lolz are crazy insane... look at those low 360 and Wii number and those PS3 numbers are kind of crazy